For normally distributed data, the skewness should be about 0. A skewness
value > 0 means that there is more weight in the left tail of the
distribution. The function skewtest can be used to determine if the
skewness value is close enough to 0, statistically speaking.

Parameters :

a : ndarray

data

axis : int or None

axis along which skewness is calculated

bias : bool

If False, then the calculations are corrected for statistical bias.

Returns :

skewness : ndarray

The skewness of values along an axis, returning 0 where all values are
equal.